keithchu · January 6, 2012 00:49 · Jan 6, 2012
diff --git a/fixorientationzoom.js b/fixorientationzoom.js
@@ -0,0 +1,53 @@
+/*
+ An attempt at fixing the dreaded iOS orientationchange zoom bug http://adactio.com/journal/5088/. Seems to work!
+ Authored by @scottjehl
+ MIT License.
+*/
+
+(function(w){
+	var doc = w.document;
+
+	if( !doc.querySelectorAll ){ return; }
+
+	var meta = doc.querySelectorAll( "meta[name=viewport]" )[ 0 ],
+		initialContent = meta && meta.getAttribute( "content" ),
+		disabledZoom = initialContent + ", maximum-scale=1.0",
+		enabledZoom = initialContent + ", maximum-scale=10.0",
+		enabled = true,
+		orientation = w.orientation,
+		rotation = 0;
+
+	if( !meta ){ return; }
+
+	function restoreZoom(){
+		meta.setAttribute( "content", enabledZoom );
+		document.body.innerHTML = document.body.innerHTML;
+		enabled = true;
+	}
+
+  	function disableZoom(){
+		meta.setAttribute( "content", disabledZoom );
+		enabled = false;
+	}
+
+	function checkTilt( e ){
+		orientation = Math.abs( w.orientation );
+		rotation = Math.abs( e.accelerationIncludingGravity.x );
+
+		if( rotation > 8 && orientation === 0 ){
+			if( enabled ){
+				disableZoom();
+			}	
+		}
+		else {
+			if( !enabled ){
+				restoreZoom();
+			}
+		}
+
+	}
+
+	w.addEventListener( "orientationchange", restoreZoom, false );
+	w.addEventListener( "devicemotion", checkTilt, false );
+
+})( this );